Method of making printers&#39; rollers.



PATENTED MAR. 8, 1904.

S. CRUMP.

METHOD 0F MAKING PRINTERS ROLLBRS.

APPLIOATION FILED JUNE 27, 1903.

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UNITED STATES Patented March 8, 1904.

PATENT OFFICE.

SAMUELH yCRUMP, POUGHKEEPVSIE, NEW YORK.

MET-Hon oF MAKING."FHRINTERSJ ROLLE-ns.

SPECIFICATION forming part ofLetters Patent No. 753,959, dated March 8,1904.

-l /Application filed Juneg27, 1903. Serial No. l63,3'73. I (No model.)f I Be it known that I, SAMUEL CRUMP, a citizen of the United Statesganda resident of Poughkeepsie, in the county of Dutchess and State of NewYork,have invented new and useful Improvements in Methods of MakingPrinters Rollers, of which thefollowing is a specification.

This invention relates to the leather-covered printers rollers which areused largely in lithographie work. These rollers consist usually of ametallic core or shaft, a leather cover, and a annel packing arrangedbetween the core and cover. In rollers of this construction the leathercover is not reliably secured to the core and packing and is liable towork loose and become twisted both in use in the press andwhen beingcleaned. The turpentine or other liquid solvent used in cleaning therollers penetrates to the flannel packing and secretes color or drypatches and also causes the flannel packing to become stiff and lumpy.The consequence is that rollers of this construction rarely are trulycylindrical when new, as the sewed seam and other inequalities areforced tothe outer surface and length of time, so that most rollers ofthis class in actual use are more or less out of true and imperfect inshape, whereby the effective working surface of these rollers is greatlyreduced, often to about one-half of the total surface.

The object of this invention is to produce a roller in which the leather.cover is tightly secured to the core orv shaft by a fiexible packing orfilling and lin Vwhich the surface of the roller is of a practicallytrue cylindrical form and not liable to change its form in use or bycleaning.

To that end the improved roller consists of a core or shaft, a leathercover,`and an interposed packing or filling of a composition whichfirmly adheres to the .cover and shaft, which is of the fiexible orelastic nature required for printers rollersand which is not affected bythe solvents usually employed for cleaning the rollers.`

In making this improved 'roller in the preferred manner the leathercover is placed in aoyl'indrical moldof the proper size and shapeto'form the roller'.- 'Ihecover is then tightly fitted against the'innercylindrical surface of' "themold by means of a rubber bag which is'placed within the leather cover and distended and'forced outwardly byinternal pressure, such as hydraulic or air'pressure, whereby the coveris pressed and fitted tightly' against the. inner face or wall of themold, The pres- 1` sure is then released, the rubber bag is removed, andthe core or shaft is placed in the mold. The liquid composition is thenadmitted to the mold and is caused to completely fill the space betweenthe core and cover, preferably by the application of pressure. The

Vair may at the same time bc lexhausted from the mold, whereby theformation of air-bubbles or empty spaces on the inner side of theleather cover is still further prevented. The composition is composed ofglue and molasses or glue and glycerin in the .proportions usuallyemployed for printers rollers, and sawdust or dry wood-pulp ispreferably added to give the composition more body and make it suitablefor use in winter as well as in summer. The composition adheres firmlyto the core and cover and connects the latter securely to the core,thereby preventing the cover from becoming loose and twisted. Thecomposition filling is yielding or elastic. Itis not affected by theliquids used for cleaning the rollers, and as the leather cover isclosely shaped to the mold and the seam and other inequalities areforced to the inner side and the formation of air-spaces is avoided informing the roller the latter is of true cylindrical formas it comesfrom the mold and retains this form in use. ner side of the leathercover form anchorages which assist in preventing the cover from shiftingits position.

In the accompanying drawings, Figure l is The inequalities on the in-lan elevation, partly in section, of my improved roller. Fig. 1. Fig. 3is an end elevation of the roller. Fig. 4 is an elevation of one of theremovable metallic heads which are used for centering the core in themold. Fig. 5 is an elevation of one of the metallic heads which are sub-Fig. 2 is a cross-section in lline 2 2,v

Stituted for the removable heads in finishing [00 -cured in any suitablemanner, preferably by drawing a puclrering wire or cord d through eachedge portion of the cover. The end heads are fitted snugly upon theshaft, so as to retain themselves in position without any v specialfastening.

E represents the removable centering heads or spiders which are placedupon the core or shaft for centering the same in the mold while the moldis being filled.

F represents the body of the cylindrical mold, which is preferably usedin an upright position.

g represents the upper head or cap of the mold, which is screwed uponthe threaded upper end of the body and provided with an inlet-nipple g',having a cock g2 and a union g3.

represents the lower head or cap, which is provided with a nipple it',having a cock ft2 and a union 71.3 for connection with the vessel I,which contains the composition. The latter is a tight vessel andprovided at its top with a pipe c', by which the air-.pressure can beapplied to the surface of the liquid composition from a pump K.

The tubular leather cover C is placed against i the inner surface of thecylindrical body F of the mold.

L, Fig. 6, represents a rubber bag, which is placed within the cover Cand has its open inner end clamped between the upper cap g and theadjacent end of the body of the mold. Upon distending this bag byhydraulic or air pressure admitted through the nipple g the cover istightly pressed and fitted or shaped against the inner surface of thecylindrical body of the mold. The pressure is then removed, the cap g isdetached from the body of the mold, and the rubber bag is withdrawn,leaving the leather cover() tightly fitted within the cylindrical bodyof themold. The core A, to which the centering-heads E have beenapplied, is now placed in the body of the mold and held centrallytherein by these heads or spiders, -as shown in Fig. 7. When the moldhas been closed, the composition is forced into the mold from the vesselI until the mold is completely filled. During the operation of fillingthe air may be exhausted from the vessel by connecting the nipple of theupper head g with an exhaust-pump, whereby any danger of air bubbles orspaces being formed in the composition filling is lessened. When themold rasees has been filled with the composition, the cori-z of theupper nipple is closed,.and air-pressure of about fifty pounds to thesquare inch is applied to the composition vessel and through the same tothe liquid composition in the mold, whereby the composition is compactedand tightly pressed against the core and cover. When the composition hasset, the heads of the mold are removed and the roller is forced out ofthe mold, which can be readily done, especially when the mold has beenproperly lubricated. The surplus composition outside of thecentering-heads E and these heads are now removed and the permanent endheads D are applied to the core at the ends of the roller.

These end heads are preferably applied by heating them, so that theyshrink on the core and are held thereby securely in place, while the endportions of the composition filling are to some extent melted by theheat and united to the end heads. The latter are preferably plainannular disks with holes to reduce their weight, while Athe removableheads E are preferably three-armed spiders with ample spaces between thearms to permit of the free passage of the composition in filling themold. The surplus leather at the ends of the cover is trimmed ofi", andthe end4 portions of the cover are turned over the end heads D andsecured by tying or Wiring, thereby'completing the roller.

The composition forms a yielding filling between the core and the cover,and this filling is tightly fitted against the core and cover, A

forming with these parts a roller which is perfectly cylindrical andwhich retains its shape in use and in cleaning.

While I have described the preferred mode of making my improved roller,itis obvious that this mode may be modified to some extent withoutdeparting from the invention. l

I do not claim my improved roller yin this application, because the sameis claimed in my application filed September 8, 1903, Serial' No.172,316.

I claim as my invention- 1. The method of forming a printers rollercomposed of a rigid core, a leather cover and a yielding compositionfilling, which consists in fitting the leather cover in a mold byinternal pressure, placing the core in the mold, filling the spacebetween the core and cover with the liquid composition, and allowing thecomposition to set, substantially as set forth.

'2. The method of forming a printers roller composed of a rigid core, aleather cover and a yielding composition filling, which consists infitting the leather cover in` a mold, placing the core in the mold,filling the space between the core and cover with the liquidcomposition, compacting the composition by pressure, and allowing thecomposition to set, substantially as set forth.

'3. The method of forming a printers roller composedof a rigid core, aleather cover and IOO a yieldingcomposition filling, which consists infitting the leather cover in arnold, placing the core in the mold,exhausting the air from the mold, filling the space between the core andcover with the liquid composition, and allowing the composition to set,substantially as set forth.

4. The method of forming a printers roller composed of a rigid core, aleather cover and a yielding composition filling, which consists infitting the leather cover in arnold, placing the core in the mold,exhausting' the air from the mold, filling the space between the coreand cover with the liquid composition, compacting the composition bypressure, and allowing the composition to'set, substantially as setforth.

fitness my hand this 415th day of June, 1903.

SAMUEL CRUMP. Witnesses: n v

RICHARD H. CLIFFORD, RUDOLPH A. HAGEDORN.

